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Income Per Share
6 Months Ended
Jun. 30, 2014
Earnings Per Share [Abstract]  
Income Per Share
INCOME PER SHARE

Basic per share amounts were computed using the weighted average number of common shares outstanding. Diluted per share amounts were calculated using the number of basic weighted average shares outstanding increased by dilutive potential common shares related to stock-based awards, as determined by the treasury stock method. The weighted average numbers of shares outstanding used to compute income per share were as follows (in thousands):
 
Three months ended June 30,
 
Six months ended June 30,
 
2014
 
2013
 
2014
 
2013
Shares used to calculate basic income per share
31,226

 
31,058

 
31,203

 
31,003

Dilutive effect of outstanding options, performance stock units and restricted stock units
372

 
372

 
383

 
357

Shares used to calculate diluted income per share
31,598

 
31,430

 
31,586

 
31,360



The weighted average numbers of shares outstanding listed in the table below were anti-dilutive and excluded from the computation of diluted income per share, primarily because the average market price did not exceed the exercise price. These shares may be dilutive potential common shares in the future (in thousands):
 
Three months ended June 30,
 
Six months ended June 30,
 
2014
 
2013
 
2014
 
2013
Stock options
271

 
307

 
282

 
306

Performance stock units
151

 
75

 
84

 
88